Smoking bad after oil block off

Just a quick question, after the oil injection block off do I still need to maintain trannsmission oil or any other fluid other than just pre mixing? Or does pre mixing cover transmission oil also..? Sorry new to the site;)
 
I hope you didn't do the oil pump delete and didn't replace the transmission oil before starting/riding it
 
I just recently bought it so I'm not sure but I imagine the last owner had done it because it runs well, there's still some fluid in the trans also I was just a bit misinformed as to if I needed to maintain any fluid other than pre mixing.. Do you recommend any type of tranny fluid or oil type?